I should have taken pictures of this, but at the time, I was too busy. I could tear my TV apart again to take a few pictures, but you won't need them. I'm posting what follows because I couldn't find any info online, and tech support was useless, so I had to figure it out for myself. And now that I have... who knows... maybe someone will find this info to be handy. Maybe even you?
Long story short: If you own a Dynex HDTV (especially model number DX-LCD32-09) and you want to permanently mute the internal speakers (because it's connected to your stereo, for example) you have two options.
First - a disclaimer. I'm simply telling you what I did to improve how my TV sends an audio signal to my stereo. For me, this has been a huge improvement - but any of the info that follows could be incorrect. I'm not saying you should do anything. Try at your own risk blah blah you know the drill. If you nuke yo' boob tube it ain' muh fauwt, mknay?
Second - an explainer: I bought the new AppleTV box. It's awesome, but it puts out slightly too loud of a signal for my TV's HDMI input, causing the audio to occasionally distort. Through trial and error, I realized the audio coming out of my TV's RCA jacks would distort, but the audio coming from the headset jack did NOT distort. Thus, there are two audio signal paths. "Fine! Instead of using the RCA output, I'll connect the headset output to my stereo." Nope. My TV lacks a way to mute the internal speakers. Sure, I could press the remote's mute button every time I turn on my TV, but that's annoying! And it's dumb. I knew there had to be a better way to permanently mute the TV's internal speakers. And that's what I did. And I'm going to tell you how to do the same.
Third - a note about those two audio paths. As I said, your TV has two signal paths for the internal audio chain that begins with a device input (HDMI, for example) and ends with your TV's outputs. We'll call these two audio paths A and B for the sake of simplification. Signal path A leads to the TV's internal speakers and headset jack. Signal path B leads to the RCA and digital outputs. The sound of signal path A can be altered using the TV's audio menu options. Signal path B ignores any changes you make here and outputs a clean, unaffected, unaltered signal.
More bass in the headset? Sure! More bass in the RCA outputs that you've connected to your stereo? Can't be done. This leads to an obvious conclusion: Buy a cheap adapter and connect the mini-plug headset output of your TV to your stereo's RCA inputs.
Again: if your Dynex TV is connected to your stereo, and you'd like to permanently mute the TV's cheesy internal speakers, you have two options:
The Service Menu Way:
On your TV's remote, press INPUT, 2, 5, 8, 0. This will bring up a hidden Service menu that even Dynex tech support don't know exists (to say they weren't helpful is an understatement).
Select "Curve Setting," then "Sound Curve Setting." For each source (AV Volume, HDMI Volume, etc), lower all of the numbers to ZERO. This will permanently mute your speakers and headset jack (until you reset the settings), but it will leave your TV's RCA outputs untouched (in other words, these settings affect Signal Path A, but they don't affect Signal path B).
To reset your TV to it's original settings, return to the Service Menu. Select "Other Setting" then "EEPROM Unit." Presto. Everything is back to the way it was when you got your TV. Here's the catch: to retain the sound curve settings you've chosen, you need to select "Save To EEPROM", so test everything out before you do so. I'd also highly encourage you to write the original settings down in your TV's manual so you'll always have them - just in case. Grin.
The better Way:
Unplug everything from your TV. Flip the TV face down. Unscrew the back (including the four screws securing the metal base attachment). Remove the plastic rear of your TV and locate the speakers. This is the part where I should have taken pictures but didn't. That's ok. You won't need 'em. Simply follow the pair of wires from each speaker to the little white-ish plug that connects them to the circuit board. See how easy it is to unplug that mofo? Do it! Your speakers are now muted since they're disconnected. To un-do this, just plug that little white jobbie back in. It's that easy.
The problem here is that Dynex did a poor job of setting up the options for some of their TVs. On my TV, the speakers don't automatically mute when a headset is connected, and there is no option to mute the speakers other than the mute button on the TV remote. This is further complicated by the fact that the TV has an option to automatically level the volume on things like obnoxiously loud commercials, but that option only works for the headset and internal speakers (signal path A). If your TV is connected to your stereo, as mine is, the only way to get this handy volume leveler (a compressor, really) is to connect the miniplug headphone output of your TV to the RCA inputs of your stereo.
Ah, but if you've unplugged the TV's internal speakers as described above, you'll be able to connect both of your TV's audio signal paths to your stereo. Connect the TV's headset output to one of your stereo's inputs for the compressed audio and connect the TV's RCA output to another of your stereo's inputs for a clean, uncompressed/unaltered signal.
Aren't options awesome? Why, yes. Yes they are.
Here's one more thing that may be useful if you're using this headset-jack for compressed audio setup: Matching volume input levels! In your Service Menu "Sound Curve Settings", you can lower the maximum volume of one of your TV's inputs to more closely match the others. For example, my stupid Comcast cable box is significantly louder than the over-the-air TV signals. So, I went into the AV Volume settings in Sound Curves and lowered the maximum from 100 to 85. Problem solved! Note that the only number you'll need to change here will be the maximum. The rest are irrelevant if you've set your TV's volume to 100%. If you're using the headset output to connect to your stereo, I'll assume you did. You can see in the sound curves pic above that I lowered the output of my AV volume (my stupid Comcast box) down from 100 to 85. That's much better!
Thanks for the excellent write up! Just getting me into the secret menu solved my problem. You're the man. man!::::: | March 18, 2012 6:48 PM
Ha! I knew if I posted this, it would eventually help somebody out. Dynex tech support is absolutely clueless.
Glad to be of help!::::: | March 18, 2012 6:54 PM
Nice info you provided.
I hope you have an answer for this one. My Dynex (2nd one now) has a message "Aging Mode" on the screen and the colours alternate between red, blue green...etc
Is there any way to correct this without returning it to Best Buy. Like I said it is the 2nd Dynex to have this problem....
Thanks in Advance
Hi Al. The only thing I can think of is to check and make sure the aging mode is turned off (see that second pic above in this post). But that's assuming you have the same model of Dynex TV that I have. It doesn't sound like you do though. I bought mine in 2008. I'm sure they sell a new model now. They've probably gone through a few versions since 2008.
Best of luck!::::: | April 29, 2012 7:41 PM
Thanks for the reply. I was hoping you knew of some way to do a factory reset, without going to the 'service menu'.::::: | April 30, 2012 3:45 AM
I don't have much knowledge on my TV but I need help please ):::::: | June 5, 2013 8:38 PM